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Shao Voon Wong - Professional Profile



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Shao Voon is from Singapore. CodeProject awarded him an MVP in recognition of his article contributions in 2019. He prefers to write applications based on 3rd party libraries than rolling out his own library. His interest lies primarily in computer graphics, software optimization, concurrency, security, and Agile methodologies.

  

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The CodeProject Authors are a group of talented technical writers who create articles and whitepapers for some of the biggest companies in the industry. Under our ContentLab.io unit we reach out to those who need content written but lack the time, expertise or resources to complete the work.

Looking to earn a little extra and get connected to, and be featured on, the websites of the companies whose technologies you know and love? If you can write well and are efficient with time then send us an email at info@contentlab.io.
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General[coderant] Zero warnings : An ideal? Pin
Shao Voon Wong16-Mar-08 23:15
mvaShao Voon Wong16-Mar-08 23:15 
Some coding books advocate zero warnings at the highest warnings level setting. Is this possible? I think not. I have seen some people resolved “conversion from 'double' to 'float'” warning by doing a float cast. They could have solved this problem by using all floats or all doubles, however we do use libraries and we do not have control over these libraries, especially third party libraries. For example,

C++
float m_f;
m_f = (float *)a_double;


The problem is by doing a cast, you are silencing the compiler by saying, “yes I know it is wrong but I am very sure a_double's value will not exceed a float max value.” On closer examination of the class , it only has 2 float member variables and all the casting from double are to be assigned to these 2 member variables. So the more correct way to solve this problem is make these 2 variables to be double type. Anyway, converting 2 floats(32 bits type) into 2 doubles(64 bits type), you only increase the memory requirement by 8 bytes. It is also much simpler than adding all the castings which need to be there.

So the correct way of solving the “conversion from double to float”, “conversion from int to short” and “< : signed/unsigned mismatch” is to change the type of variable to match the other type. For example,

C++
// Wrong way
for( int i=0; i<(int)vec.size(); ++i ) {
....
}

// Correct way: size_t is the same unsigned type as vec.size() returns
for( size_t i=0; i<vec.size(); ++i ) {
....
}


If you use casting to resolve these type mismatch warning, you might as well use pragmas to silence the warnings, that is what pragmas are used for! When something has gone wrong and you cannot figure it out why, you can remove the pragmas and re-enable the warnings back. With casting, you can't!

Zero warnings to me, is an “hard to achieve” ideal because things are not always clear cut. I will always try my best to reduce warnings to the minimum, but I would rather leave some unresolvable warnings there, so that I know where to look if something goes wrong.

modified 3-May-17 2:10am.

GeneralRe: [coderant] Zero warnings : An ideal? Pin
Vasudevan Deepak Kumar17-Mar-08 0:36
MemberVasudevan Deepak Kumar17-Mar-08 0:36 

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